US1352360A - William o - Google Patents

Description

W. O. DWYER.

STATIONARY INDUCTION APPARATUS.

PPLICATION FILED FLB. 27, I920. 1,352,360, PatentedSept. 7,1920.

Fig. I. m

Volts.

Inventor-t William O Dw yer;

H is Attorney.

UNITED STATES? WILLIAM C.

PATENT OFFICE.

DWYER,-. OF PITTSFIELD, :MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC'COMPANY', AL CORPORATION OF NEW YORK.

H STATIONARY INDUCTION APPARATUS; 1

"To all whom it may concemf v Be it known 'that I, VVI IQIAM DwYnn; a subject of the King ofGr'e'at Britain,residing at Pittsfield county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Stationary Induction' Apparatus, ofiwhieh the following is a specification. My i ent o e t sfjto s i n y i tion apparatus and for its general ob; j s mpr v s a ran ment 0f "p rt w a w re: is p duced la" d vic of. this character, having better electrical v proper tiesfatfles's cost and "iwith more "'efiioient utilization of the materials of construction than hasheretofore beenaccomplished.

' It has heretofore been 'propose dto reduce the insulationemployed in windings; particularly those having one end "grounded, by bringing the line lead'into conducting'relation with the windings atthe central point of a windingstack, as shownin the. application of O. 1Stephens, Serial No. 137,548, in order that'such connection will;v be as far removed from'the end iron of thecore as possible. connecting each side of the winding stack in parallel frorn'this central point the charging current also isreduced.

By my invention ho 'yeverg a still more desirable electrical effect is accomplishedf or Iv employ a condenser elem'ent disposed among the windings at the middle point of the winding stack'whi'ch electrostatically imposes a desired distribution of voltage throughout the coils and coil stack so that it is impossible for-high initial and subse: quent resonant voltages tobuild up in the windings or'coils by steep wave fronts. I may thus considerably decrease the quantity of insulation previously employed and yet have the desired margin ofsaiety.

It will readily be appreciated that among the advantages had from this construction is animproved space factor due to the need for'less insulation. together with a more economical use of the material of construction such as the iron and copper commonly employed.

Other advantages and objects of my invention will appear-"from the following detailed description when taken in connection with the accompanying drawing in which:

Figure 1 shows a view mainly in vertical section of a transformer having the high voltage winding constructed to embody my :planator'y' diagrams.

Specification of Letters Patent. Patented Sept, 7, 1920, Ap plicationfiled Februar 27, 1920; Serial a, 361,702.

invention. Fig. 2 is'a horizontal mid-section of the transformer shown in Fig. 1. lgs. 3 andfl show details in the constructlons employed. And i ileferring iPiW Fto the drawing, and partlcularly to Fig. "1,Ihave; shown a transformer havingz a, core 10; provided with a cylindrical l'ow vo'l'tagewinding 11 arranged aboutthe cent 1 legf12 of the core. Exterlorly of this low oltage winding 11 is'the high Y9ltage ;W.- 1ng13, ,which'in accord ance with'my p nt invention is. preferably ofthe'diskf'cOil construction; 1 The winding 13 is arrangedto ,have a. terminal leading we supply line adapted for connection to' the middle point of the windingstack, as shown at 14. I Since my invention-is particularly applicable totransformers having one terminal "of the high voltage winding groundedg th'ejtwo end's of the coil stack are accordingly-Q} indicated as connected to ground v as at: 15 and 16. Theo oils of winding 13 are arranged and connectedso that the current from the line terminal 14, at any instant, flows in thesame direction about the winding axis" which is a a 'fsingle' straight line) whether i consider that portiondn the group of coils :above" the center or that in the 'groupbelow the center. Hence the magnetic flux in the core engendered by the high voltage current has everywhere the same directionetlany-instant.

At the middle of the high'voltage coil stack, I insert the substantially circular 'conducting-plate 2Q, to eiiect-by condenser action the potential distribution across the upper and lower portions of the coil stack in accordance with my invention. This plate 20 is split, as indicated at 21 in'Fig. 2, the ends being-insulated apart by means of insulation 22 to prevent a short circuited current from flowing in this element; and is also conductivcly connected to the line terminal '14 as indicated at 23.

The plate 20 is preferably made from one strip of conducting material, such as steel or copper, and is incased in an insulating jacket 24 as shown in Fig. 3 in a manner substantially similar to that on the coils in the winding 13. By reason of the splitting of the plate 20, as at 21, it may with advantage in some instances be made the first turn of windings in the upper and lower groups of coils of the coil stack since the Figs.' 5 and 6 are ,ex-

-sulatingj'acket 34. The conductors 80, form the plate element, but all will be cut through at some point precisely similar to the point 21 in plate 20. plate element of this type is connected to the line by means of the conductor .23.

' When inoperation, a conducting plate of this type in the center of the coil stack, draws a 'leading'or charging current from the line electrostatically imposes a substantially uniform potential distribution throughout 'both the upper and lower ;portions of the coil stack. Thiswill be readily comprehended by reference to Figs. 5: and 6. In Fig. 5 Idhave drawn at E lines to represent the electrostatic flux (neglecting edge efiects) emanating from the charge on plate 20 fora given instant; the broken lines S being similarly drawn to denote the equipotential surfaces corresponding to the lines E. Since the plate 20 and the yokes of core 10 co rrespond to the elements of a condenser when the plate 20 is charged, the active portions of which elements are substantinally planes, the-electrostatic distribution of the potential-across the space intervening between these elements will be at substantially a uniform rate. The windings 13 and 13 inserted in these spaces are, by this condenser action, themselves brought to their desired potential by electrostatic induction without-drawing a charging current from the line, or what is the same thing rcgarded in a different aspect, the shunt capacitance of the windings have been reduced to a substantially negligible value.

In Figs. 6 I have plotted the potential of the coilslagainst turns, when-my invention is applied. Itis thus seen that for the mean turn of eachcoil a substantially uniform rate of distribution is accomplished.

. Having now described an embodiment of my invention which is at present the best means known to me for carrying the same into efiect, I would have it understood that this is merely illustrative and that I do not .mean to be limited thereby to the precise cally imposing throughout said paths a desired potential distribution.

2. An electrical winding arranged to be supplied with current at substantially its middle point and to conduct the same in multiple paths diverging from said middle point. advancing in the same direction about the winding axis, having a condenser element located at said middle point and conductively related to said windings.

3. In an electrical apparatus, the combination with a winding stack having a gle rectilinear winding axis, of a terminal connection at substantially the middle of said stack, saidwinding being arranged to conduct current in parallel paths, one for each section at the side-of said connection, both to advance in the same direction about said winding axis, and a condenser element located at the middle of said winding stack arranged to electrostatically induce a substantially uniform potential distribution throughout each Winding section.

4. In a transformer and the like, the combination with a core, of a high voltage winding composed of a stack of disk-coils having a single rectilinear winding axis, a conducting element having approximately the dimensions of a disk coil located at sub stantially the mid point of said stack, said element being conductively connected directly to the lineand to the coils at each side thereof, the coils at each side of said element arranged to conduct current in the same direction aboutsaid winding axis.

In witness whereof, I have hereunto set my hand this twentieth (20th) day of February, 1920.

7 WILLIAM O. DWYER.

Images